I need help with a and b please

One of your new enployees notes that your debt has a lower cost of capial (6%) than your equity (16\%) So, he suggests that the firm swap its capital structure from 28% debt and 72% equity to 72% debt and 26% equaty instead. He estmates that afler the swap. your cost of equily would be 219% a. What would be your new cost of debe? Make your calculations based on your firm's pre-exs WhCC b. Have you lowered your overall cost of capitar? a. The new cost of debt is (Round to two decimal places)